Stretched Rohini Satellite Series
{{Infobox spacecraft class
| image =
| caption =
| name = Stretched Rohini Satellite Series
| manufacturer = ISRO
| country = India
| applications = Gamma ray astronomy
| orbits = Low Earth
| operator = ISRO
| lifetime = 2 years
| derivedfrom = Rohini
| status = Retired
| built = 4
| launched = 4
| retired = 1
| lost = 3
| first = SROSS-A/SROSS-1
24 March 1987
| last = SROSS-C2
4 May 1994
| lastretired =
|autoconvert = off
| mass = {{convert|106|-|150|kg|lb}}
| power = ~100 watts
| batteries = Ni-Cd
| equipment = Gamma-Ray Burst
Retarded Potential Analyser{{citation needed|date=October 2013}}
| dimensions =
| x_axis =
| y_axis =
| z_axis =
}}
The Stretched Rohini Satellite Series (SROSS) are a series of satellites developed by the Indian Space Research Organisation as follow ons to the Rohini Satellites{{cite web |url=http://msl.jpl.nasa.gov/QuickLooks/srossQL.html |title=SROSS A, B, C, C2 Quicklook |access-date=2009-07-19 |url-status=dead |archive-url=https://web.archive.org/web/20090411021025/http://msl.jpl.nasa.gov/QuickLooks/srossQL.html |archive-date=2009-04-11 }} for conducting astrophysics, Earth Remote Sensing, and upper atmospheric monitoring experiments as well as for new and novel application-oriented missions.{{Cite web|url=http://www.astronautix.com/s/sross.html|archive-url=https://web.archive.org/web/20161228041748/http://astronautix.com/s/sross.html|url-status=dead|archive-date=December 28, 2016|title=SROSS}} These satellites were the payload of the developmental flights of the Augmented Satellite Launch Vehicle.
Satellites in series
= SROSS A and SROSS B =
The first two satellites in the series did not make it into orbit due to launch vehicle failure. SROSS-A carried two retro-reflectors for laser tracking. SROSS-B carried two instruments; a West German Monocular Electro Optical Stereo Scanner (MEOSS) and ISRO's 20-3000keV Gamma-ray Burst Experiment (GRB).
= SROSS C =
The third, SROSS 3 (also known as SROSS C), attained a lower-than-planned orbit on 20 May 1992. The GRB monitored celestial gamma ray bursts in the energy range 20–3000 keV. SROSS C and C2 carried a gamma-ray burst (GRB) experiment and a Retarded Potential Analyzer (RPA) experiment. The GRB experiment operated from 25 May 1992 until reentry on 14 July 1992. The instrument consisted of a main and a redundant CsI(Na) scintillator operating in the energy range 20–3000 keV. The crystals were 76 mm (main) and 37 mm (redundant) in diameter. Each had a thickness of 12.5 mm. A 'burst mode' was triggered by the 100–1024 keV count rate exceeding a preset limit during a 256 or 1024 ms time integration. In this mode, 65 s of temporal and 2 s of spectral data prior to the trigger are stored, as well as the subsequent 16 s of spectral data and 204 s of temporal data. The low resolution data consists of two energy channels (20–100 keV and 100–1024 keV) from 65 s before the trigger to 204 s after the trigger in 256 ms integrations. The 20–1024 keV rates are also recorded with a 2 ms resolution for 1 s prior to 1 s after trigger and a 16 ms resolution for 1s prior to 8 s after the trigger. Energy spectra are conducted with a 124 channel PHA. Four pre-trigger spectra and 32 post-trigger spectra are recorded for every burst with a 512 ms integration time.{{Cite web|url=http://heasarc.gsfc.nasa.gov/docs/heasarc/missions/sross3.html|title = Stretched Rohini Satellite Series 3 & C2}} The RPA measured temperature, density and characteristics of electrons in the Earth's ionosphere. The GRB experiment computer system used the RCA CDP1802 microprocessor.{{Cite web|url=http://www.currentscience.ac.in/Downloads/article_id_069_09_0732_0739_0.pdf|title=Cosmic gamma ray bursts - Recent developments and observations from SROSS satellites|date=10 Nov 1995|website=Current Science Research Journal}}
= SROSS C2 =
{{Main article| SROSS-C2}}
SROSS-C2 was launched on 4 May 1994. The gamma ray burst experiments on board SROSS-C2 are an improved version of the GRB payload flown successfully on the SROSS-C satellite. The improvements include enhancements of the on-board memory and a better measurement of the background spectra after a burst event. These improvements led to the discovery of twelve candidate events detected up to 15 February 1995, out of a total of 993 triggers. The SROSS-C2 spacecraft is one of the satellites included in the Interplanetary Network{{Cite web|url=http://www.ssl.berkeley.edu/ipn3/|title=IPN3 Home Page}} The SROSS C2 satellite also used an RCA CDP1802 microprocessor for the GRB experiment.{{Cite journal|url=http://articles.adsabs.harvard.edu//full/1997A%26A...322..778K/0000780.000.html|title=Recent gamma-ray burst observations from the SROSS-C2 satellite|date=7 Aug 1995|journal=Astronomy and Astrophysics|bibcode=1997A&A...322..778K|last1=Kasturirangan |first1=K. |last2=Padmini |first2=V. N. |last3=Prasad |first3=N. L. |last4=Rao |first4=U. R. |last5=Seetha |first5=S. |volume=322 |page=778 }}